Method and apparatus for high-voltage D.C. transmission with a b

Details Method and apparatus for high-voltage D.C. transmission with a b Method and apparatus for high-voltage D.C. transmission with a b

1985-02-28

1987-01-20

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363 49, 363 51, H02J 336

Patent

active

046384162

ABSTRACT:
A method and apparatus are described for operating a high voltage d.c. (HVDC) transmission line system connecting two a.c. transmission line systems during normal operation and during malfunction in either the rectifier station or the inverter station of the HVDC system.
When a malfunction exists in one station of a HVDC transmission line, such as a rectifier station, then the regular thyristor firings are disabled and a bypass circuit, preferrably one or several bridge paths of a converter, are fired. As soon as a corresponding change in the current or voltage occurs at the d.c. voltage connections of the other station, this station assumes rectifier operation during which the HVDC transmission line is utilized as a reactive load to stabilize the other system. Once the malfunction has ceased to exist, operation is first resumed in the first station by extinguishing the bypass thyristors and subsequently resumed also in the other station. This procedure permits stable normal operation in both stations, or bypass operation without using remote control signals during which the HVDC transmission line can be rapidly controlled to stabilize the systems.

REFERENCES:
patent: 3648147 (1972-03-01), Leete
patent: 4250542 (1981-02-01), Bulakhov et al.
patent: 4263517 (1981-04-01), Konishi
patent: 4429357 (1984-01-01), Hausler et al.
patent: 4516198 (1985-05-01), Liss

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